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test: add tests for function equality behavior

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Add tests for function equality covering both direct comparisons and
comparisons within composite types (lists and attribute sets).

Tests verify:
- Direct function comparisons always return false
- Value identity optimization in composite types allows identical
  functions to compare as equal when both references point to the
  same function value
This commit is contained in:
Robert Hensing 2025-12-07 14:43:46 +01:00
parent 97a60c1fab
commit 6fb5276e7b
12 changed files with 37 additions and 0 deletions
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1
tests/functional/lang/eval-okay-equal-function-attrset-distinct-similar.exp Normal file
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false

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tests/functional/lang/eval-okay-equal-function-attrset-distinct-similar.nix Normal file
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# Distinct but not identical functions in attribute set compare as unequal
# See https://nix.dev/manual/nix/latest/language/operators#equality
{ a = (x: x); } == { a = (x: x); }

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tests/functional/lang/eval-okay-equal-function-attrset-identical.exp Normal file
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true

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tests/functional/lang/eval-okay-equal-function-attrset-identical.nix Normal file
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# Function comparison in attribute set uses value identity optimization
# See https://nix.dev/manual/nix/latest/language/operators#value-identity-optimization
let
f = x: x;
in
{
a = f;
} == {
a = f;
}

1
tests/functional/lang/eval-okay-equal-function-direct-distinct-similar.exp Normal file
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false

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tests/functional/lang/eval-okay-equal-function-direct-distinct-similar.nix Normal file
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# Direct comparison of distinct but not identical functions returns false
# See https://nix.dev/manual/nix/latest/language/operators#equality
(x: x) == (x: x)

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tests/functional/lang/eval-okay-equal-function-direct-identical.exp Normal file
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false

6
tests/functional/lang/eval-okay-equal-function-direct-identical.nix Normal file
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# Direct comparison of identical function returns false
# See https://nix.dev/manual/nix/latest/language/operators#equality
let
f = x: x;
in
f == f

1
tests/functional/lang/eval-okay-equal-function-list-distinct-similar.exp Normal file
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false

3
tests/functional/lang/eval-okay-equal-function-list-distinct-similar.nix Normal file
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# Distinct but not identical functions in list compare as unequal
# See https://nix.dev/manual/nix/latest/language/operators#equality
[ (x: x) ] == [ (x: x) ]

1
tests/functional/lang/eval-okay-equal-function-list-identical.exp Normal file
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true

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tests/functional/lang/eval-okay-equal-function-list-identical.nix Normal file
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# Function comparison in list uses value identity optimization
# See https://nix.dev/manual/nix/latest/language/operators#value-identity-optimization
let
f = x: x;
in
[ f ] == [ f ]